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Fly Ash Sorting Series

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Brief Introduction of YGM Series Fly Ash Special High Efficiency Ball Mill
I. Overview With the increasingly mature and popularized technology of comprehensive utilization of fly ash in China, the comprehensive utilization of fly ash is not limited to environmental protection requirements, and the huge economic benefits of comprehensive utilization of fly ash have been reflected. In the southeast coast of China and in some developed areas, the fine ash products of fine ash have even been in short supply. At present, the fly ash raw ash emitted by a large number of domestic coal-fired power plants generally has a fineness value between 20% and 50% (325 mesh sieve), which does not reach the first level prescribed by national standards (GB196-91). Ash and secondary ash requirements. Each power plant generally adopts the fly ash dry separation technology to separate coarse and fine raw ash to obtain the fine ash of the finished product, and obtain certain economic benefits. However, the coarse ash after sorting (usually a fineness value of about 65%) has not been fully utilized, and is generally still discharged on site or sold at a low price, and even becomes a burden for enterprises. Utilizing a special ultrafine mill for fly ash to ultrafinely grind the raw ash or the coarse ash after the sorting, so that it has a certain hydraulic activity, and produces **** capable of formulating high-performance concrete. Blended with ultra-fine ash to achieve the purpose of complete utilization of fly ash, creating greater economic benefits. Ball mill is used for powder grinding, which has been applied in the cement industry for many years. The technology is mature and the mill products have been relatively serialized. Drawing on the principles and structures of a variety of high-fine and high-yield cement mills at home and abroad, the research department of Yancheng Yanfu Environmental Protection Equipment Co., Ltd. has jointly developed a comprehensive application of domestic fly ash, the Department of Materials Science, Nanjing University of Technology, and successfully developed pulverized coal A special ball mill for ash fine grinding is used to grind raw ash or coarse ash discharged from coal-fired power plants to achieve the ash fineness of the finished product. A sorting device is added after the ball mill to sort the coal ash milled by the ball mill. After the sorting, the coarse ash is returned to the ball mill for ultra-fine grinding to produce a **** blend capable of formulating high-performance radon. (Fine powder), which greatly improves the economic benefits of comprehensive utilization of fly ash, and can achieve all comprehensive utilization of fly ash. Overview of the series fly ash grinding system 1. Introduction of the grinding system process The YGM series fly ash ultrafine ball mill system is mainly composed of the original ash silo, auxiliary silo, screw feeder, electronic weighing scale, special fly ash ball mill, It consists of powder separator, air box pulse bag filter, induced draft fan, screw conveyor, bucket elevator, feeder, control system and so on. The system takes the ash directly from the original ash bin, feeds it through the screw feeder, and after electronic weighing, it is transported by the air chute into the grinding head elevator, and the elevator is fed into the powder separator for classification before grinding. The coarse ash after selection is sent to the mill inlet through the air chute and enters the ball mill for grinding. The material ground by the mill contains a large amount of fine ash, which is fed into the powder separator by the hoist again for sorting. The ash is sent to the finished ash warehouse through the subsequent conveying equipment. The dust collection system at the end of the mill is used for dust collection. Compared with the open circuit (no powder separator) system, this closed-circuit grinding process can increase the output of the table by more than 30-40% , Is the ideal equipment for fine grinding and deep processing of fly ash. 2. Flow chart of grinding system (attached) Working principle: YGM series fly ash mill consists of working parts such as feeding part, barrel part and discharging part, as well as bearing seat, large and small gears, reducer, coupling, etc. It consists of transmission parts, motors and electronic control parts. 3. The ordinary ball mill is transformed into a YGM series fly ash special-purpose grinder. The barrel of the mill is generally divided into two bins. According to the particle size composition of the fly ash or coarse ash and the mixture and its ease of grinding, the internal device of the ball mill is carried out. Transformation of special ultra-fine grinding for fly ash: The YGM series propeller-shaped fly ash mill special double-layer sieve partition silo board is used to reform the ball mill system to make it more suitable for closed-circuit production of fly ash grinding. Craft. 参数 YGM series propeller-shaped fly ash mill double-layer sieve partition board parameters: ⑴ 篦 plate, guard plate with holes: casting material: manganese chromium alloy quilting: 5mm 筛 screen frame: special for fly ash grinding, material Imported wear-resistant steel plate; ⑶ Screen plate: Stamping material: δ3mm stainless steel ?? Screen gap: 1.2 ~ 1.5mm ⑷ Standard parts: (Cylinder and screen frame connecting bolts and nuts) Depending on the specifications of the mill ㈡ Specific reform measures : ⑴ Replace the original compartment board with a special double-layer sieve partition board special for fly ash. The quilting of the compartment board is 5mm, and the middle stainless steel sieve board is 1.2mm, which can effectively control the particle size of the particles entering the second bin. Accelerate the introduction of qualified granules from one bin to the second bin for efficient grinding, reducing over-grinding in one bin. 确定 Determine the length of one bin of the mill according to the degree of easy grinding of the fly ash and moisture. Usually, one bin uses steel balls of φ20 ~ φ50 for ball distribution, and the second bin uses small size steel of φ8 ~ φ16 for forging. Larger, it can efficiently grind fine particles. At the same time, reducing the diameter of the grinding body can delay the flow rate of the material in the mill, increase the residence time of the material in the mill, and strengthen the grinding. (3) Adding an activated liner in the mill tail bin can effectively slow down the material flow velocity in the tail bin, and at the same time, it can enhance the grinding function of small forging and increase the specific surface area of the product. 尾 The tailing discharge screed plate is a special quilting 5mm discharge screed plate (which can be modified on the original basis). The diameter of the lifting plate is adjusted to control the material discharge flow rate. The back end of the double-layer compartment board adopts a protective quilt with ventilation quilting, which not only protects the stainless steel sieve plate from being abraded by the grinding body, but also strengthens the ventilation inside the mill, promotes the qualified fine powder to be discharged out of the mill in time, and reduces over-milling . ⑸ Choose a suitable ventilation speed in the mill, suitable wind speed 0.8 ~ 1.0m / s, shorten the residence time of qualified fine materials in the mill, promote the heat generated by fine powder and grinding to be discharged out of the mill in time, and improve the grinding efficiency. 翻 A flap air lock device should be installed at the cutting end of the grinding tail, and the air lock device should be flexible. Generally, the circulation process is adopted, which can significantly increase the system hourly output, reduce the power consumption per unit product, and reduce production costs. The mill adopts pulse bag dust collector for dust removal, and the fan motor adopts frequency conversion speed regulation to adjust the wind speed in the mill and control the material flow rate and fineness. Third, installation instructions 1, installation foundation instructions (1), this type of mill must be installed on a dry and reinforced concrete foundation (2), the foundation must not be significantly inclined and sinking, if a little sinking also It should be balanced and level, otherwise the installation cannot be performed. (3) The foundation and ground plane of this type of mill should have sufficient height for replacement of liners and grinding media. (4) The design of the foundation can be carried out with reference to the company's foundation diagram. However, this drawing cannot be used directly as a foundation construction work drawing. 2. Preparations before installation (1) Before installation, the anti-rust oil protection on all parts and components' processing work surfaces and the dust and dirt falling during transportation must be removed. (2) Check the working surfaces and threads, and eliminate defects generated during transportation and loading and unloading. (3) The assembled components should be carefully inspected. If some parts are damaged or lost during transportation and storage, the defective parts must be repaired or replaced, and the missing parts must be completed. (4) The parts contacting or connecting with the processing surface should be lubricated during installation, dry oil should be used for fixed surface, and thin oil should be used for movable surface. (5) Before installation, all the grooves and pits on the foundation should be cleaned, and the surface of the concrete to be poured must be free of oil stains. (6) The friction surface should be protected during installation. It should not be cleaned with cotton yarn or dirty oil. The parts prone to dirt on the processing surface should be covered with a special protective plate and a clean canvas. Fourth, technical parameters
parameter Ⅰ-level ash output (t / h) Product 45μm square hole sieve Speed (r / min) Grinding body loading (t) Power (kw) Weight (t)
Φ1.83 * 7M 8 < 12% 23.9 twenty one 245
Φ2.2 * 7.5M 14 ~ 18 < 12% twenty one 35 ~ 38 380 49.5
Φ2.2 * 9M 18 ~ 22 < 12% 20.91 42 ~ 45 475 66
Φ2.4 * 8M 22 ~ 26 < 12% 20.91 50 ~ 53 570 76.4
Φ2.4 * 11M 26 ~ 34 < 12% twenty one 62 ~ 65 710 125
Φ2.6 * 13M 35 ~ 45 < 12% 20.6 81 1000 158
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